package com.hs.srm.admin.common.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;

import com.hs.srm.base.common.config.SysConfig;
import com.hs.srm.common.exception.RExceptionEnum;
import com.hs.srm.common.exception.RRException;

/**
 * @author Wangpeidong
 * @create 2018-08-04 12:54
 **/
@Component
public class PoiUtils {
	
	public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName,
	        boolean isCreateHeader, HttpServletResponse response) {
		ExportParams exportParams = new ExportParams(title, sheetName);
		exportParams.setCreateHeadRows(isCreateHeader);
		defaultExport(list, pojoClass, fileName, response, exportParams);
	}
	
	public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName,
	        String relativePath) {
		exportToFile(list, pojoClass, fileName, relativePath, new ExportParams(title, sheetName));
	}
	
	public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
		defaultExport(list, fileName, response);
	}
	
	private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response,
	        ExportParams exportParams) {
		Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
		if(workbook != null) {
			downLoadExcel(fileName, response, workbook);
		}
	}
	
	private static void exportToFile(List<?> list, Class<?> pojoClass, String fileName, String relativePath,
	        ExportParams exportParams) {
		Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
		String rootPath = SysConfig.getExportPath();
		try {
			if(!rootPath.endsWith(File.separator)) {
				rootPath += File.separator;
			}
			if(!relativePath.endsWith(File.separator)) {
				relativePath += File.separator;
			}
			String path = rootPath + relativePath;
			// 判断目录存不存在,不存在得加上
			File file = new File(path);
			if(!file.exists() && !file.isDirectory()) {
				file.mkdirs();
			}
			OutputStream out = new FileOutputStream(path + fileName);
			workbook.write(out);
			out.close();
		} catch(Exception e) {
			throw new RRException(RExceptionEnum.FILE_EXPORT_ERROR.getMessage(),
			        RExceptionEnum.FILE_EXPORT_ERROR.getCode());
		} finally {
			try {
				workbook.close();
			} catch(IOException ex) {
				// TODO Auto-generated catch block
				ex.printStackTrace();
			}
		}
	}
	
	private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
		try {
			response.setCharacterEncoding("UTF-8");
			response.setHeader("content-Type", "application/vnd.ms-excel");
			response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
			workbook.write(response.getOutputStream());
		} catch(IOException e) {
			throw new RRException(e.getMessage(), 500);
		}
	}
	
	private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
		Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
		if(workbook != null) {
			downLoadExcel(fileName, response, workbook);
		}
		
	}
	
	public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
		if(StringUtils.isBlank(filePath)) {
			return null;
		}
		ImportParams params = new ImportParams();
		params.setTitleRows(titleRows);
		params.setHeadRows(headerRows);
		List<T> list = null;
		try {
			list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
		} catch(NoSuchElementException e) {
			throw new RRException("模板不能为空", 500);
		} catch(Exception e) {
			e.printStackTrace();
			throw new RRException(e.getMessage(), 500);
		}
		return list;
	}
	
	public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows,
	        Class<T> pojoClass) {
		if(file == null) {
			return null;
		}
		ImportParams params = new ImportParams();
		params.setTitleRows(titleRows);
		params.setHeadRows(headerRows);
		List<T> list = null;
		try {
			list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
		} catch(NoSuchElementException e) {
			throw new RRException("excel文件不能为空");
		} catch(Exception e) {
			throw new RRException(e.getMessage());
		}
		return list;
	}
	
}
